A Study on The Birefringence Measurement in Precision Optical Product

정밀 광학 부품의 복굴절 측정 방법에 관한 연구

  • 민인기 (단국대학교 기계공학과 대학원) ;
  • 고영배 (단국대학교 기계공학과 대학원) ;
  • 권창오 (동아정밀) ;
  • 윤경환 (단국대학교 기계공학과 대학원)
  • Received : 2011.12.20
  • Accepted : 2012.04.27
  • Published : 2012.06.29

Abstract

Recently, injection molding process became more popular than ever to produce large quantities of high precision products. Extensive studies have been conducted for reducing the residual stresses and birefringence in injection-molded optical products. Flow-induced and thermally-induced stresses and birefringence have been found as two main sources during injection molding process. Generally, quantitative value of birefringence can be measured with polarizing microscope using the compensator. However, it is difficult to measure low order retardation with microscope, so developing a measurement system for low order optical path difference is in need. In the present paper, a system using Photo Elastic Modulator (PEM) is demonstrated to measure low phase retardation in injection-molded products.

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Acknowledgement

Supported by : 한국산업기술평가관리원